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Ryobi, 31cc, 2-cycle Roto-tiller, MTD-21A-121R900

The engine assembly has vibrated off from the shaft that turns the tiller's tines. I need a schematic and parts list with cost. Please help.

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  • Anonymous Apr 02, 2009

    tiller blades don't turn

  • jim7542 Apr 23, 2009

    how do you take a flywheel off a rototiller troybilt 6hp I chaged plug and still not getting enough spark

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6 Suggested Answers

  • 1 Answer

SOURCE: I need a manual for my MTD Huskee 5hp rear tine tiller

I went to MTD web site and they had all the manuals for all there products. You will need a model and serial number to get them. Thank you for responding back to me.
I got the manual for the tiller and the engine.

Posted on Apr 13, 2009

  • 1 Answer

SOURCE: tines wont turn

Without really knowing what is broken it will be tough to give a firm idea of the cost. However, you can head over to www.partstree.com. They have a great detailed parts break down and costs associated with it. Looked up your part numer and can find at this link: http://www.partstree.com/parts/?lc=mtd&mn=210-031-000+%281990%29

Posted on May 07, 2009

  • 221 Answers

SOURCE: MTD series 410 rear tine tiller drive wheels slip

I have the same issue with one I am working on. It appears the keys in the drive shaft are not rotating far enough out on the drive gear side to fully engage in the gear. I have studied and studied this and so far I have been unable to determine why. If I find out I will let you know. I am also trying to figure out what is supposed to pull these keys out of the till engagement gear.

Posted on May 14, 2010

  • 1 Answer

SOURCE: mtd rear tines tiller won't engage tines. F and R

I had similar problem recently with 2007 Huskee MTD series 410. The shift assembly bent and couldn't move the clutch collar all the way over on the drive shaft.

4395dea.jpg

Posted on May 27, 2010

  • 221 Answers

SOURCE: MTD Series 410 rear tine tiller. Tines won't engage.

As much as I hate to admit it, I have one in my shop I have been working on for a friend. Like ehertig_cwc shows in his picture of the shifter forks they can and do bend. The part i hate to admit is I have been unable to fix this one. Yeah, the shifter forks were bent and the pins worn to nothing. I repaired that and put it back together and I'm sure some of you how long that takes. It worked for about 20 minutes and I lost all shift detents. I have studied and studied that drive shaft shifter section and for the life of me I have been unable to determine what keeps the dang detent ball from rotating and getting into the shafts keyed section. As soon as it does, you loose or soon will loose shifting as the clutch just floats around in there. I have two MTD service manuals and neither on shows this drive shaft apart or how to assemble it. I think it is magic how it works. Other than this part I find the gearbox pretty easy to work on.

Posted on Jun 30, 2010

  • 2 Answers

SOURCE: tiller tines won't turn where put in gear.

The spring goes in first followed by the ball. The ball should not get in the key way because that is filled by the slider pins that go up into the spur gear that drives the tines. Actually the slider pins drive all of the gears by engaging different gears as the gear collar is moved up and down. The detent spring and ball is the mechanism that is supposed to hold the the clutch collar in place. Mine jumps out of gear when tilling any depth except very shallow. I have reinforced the shifting forks and replaced the pins on the end of it. I believe that the pins wear and the arms spread because i have to keep pressure on the shifting rod or it will jump out of gear when tilling. Even with the reinforcing, pressure on the shifting rod will wear out the pins on the shifting arm. This will be my 3rd reassembly and I am leaning toward the detent spring being weak and allowing the shifting collar to move too easily. I may order an new spring and ball and see if that helps. I am getting pretty good at taking it apart.

Posted on Apr 16, 2011

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Mtd rear tines tiller won't engage tines. F and R


I had similar problem recently with 2007 Huskee MTD series 410. The shift assembly bent and couldn't move the clutch collar all the way over on the drive shaft.

4395dea.jpg

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I need a manual for my MTD Huskee 5hp rear tine tiller. Model # 21A 410 131. Briggs and Stratton motor. 18'' tilling width.


I went to MTD web site and they had all the manuals for all there products. You will need a model and serial number to get them. Thank you for responding back to me.
I got the manual for the tiller and the engine.

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